04. Mühendislik Fakültesi / Faculty of Engineering

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10. Kuruluş Yıldönümünde Makina Teorisi Derneği
(Makina Teorisi Derneği, 2021-05-31) Kiper, Gökhan; Söylemez, Eres; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
31 Mayıs 2011’de Ankara’da kurulan Makine Teorisi Derneği (MakTeD) [1], Meksika’nın Guanajuato şehrinde gerçekleştirilen 13. Uluslararası Mekanizmalar ve Makina Teorisi Federasyonu (IFToMM) [2] Dünya Kongresi sırasında 22 Haziran 2011’de IFToMM üye kuruluşu olmuştur. IFToMM, 29 Eylül 1969’da Polonya’nın Zakopane şehrinde 2. Mekanizma ve Makine Teorisi Dünya Kongresi sırasında Prof. Ivan I. Artobolevski (SSCB) ve Prof. Erskine F.R. Crossley (ABD) öncülüğünde soğuk savaştan etkilenmeden Mekanizma ve Makina Bilimi (MMB) alanında uluslararası işbirliğini geliştirmek üzere kurulmuştur [3]. IFToMM’un ana hedefleri MMB alanlanında kuramsal, deneysel ve uygulamalı çalışmalarda araştırma ve geliştirmeyi desteklemek, MMB ya da ilgili alanlarda bilimsel ve mühendislik çalışmaları yürüten farklı ülkelerdeki kişi ve kuruluşların temaslarını yaygınlaştırmak ve gelişmekte olan ülkelere uzmanların seyahat desteği, özel kurslar düzenlenmesi ve diğer girişimlerle MMB çalışmalarını desteklemektir [4]. IFToMM camiası halen özellikle gelişmemiş ve gelişmekte olan ülkelerde MMB çalışmalarını destekleme misyonunu sürdürmektedir.
3-rrs Paralel Manipülatörün Dinamik Analizi
(Makina Teorisi Derneği, 2017-07-05) Tetik, Halil; Kiper, Gökhan; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
Bu çalışmada, İzmir Yüksek Teknoloji Enstitüsü Rasim Alizade Mekatronik Laboratuvarında bulunan, 3-RRS kinematik zincir yapısına sahip 3 serbestlik dereceli bir paralel manipülatörün dinamik analizi sunulmuştur. Öncelikle ters ve düz konum, hız ve ivme denklemleri verilmiş, ardından bu denklemler kullanılarak oluşturulan ters dinamik model denklemleri sunulmuştur. Ters dinamik analiz virtüel iş prensibi ve Lagrange yöntemleri kullanılarak yapılmıştır ve sonuçlar birbirleri ile karşılaştırılarak doğrulama yapılmıştır. Analitik formülasyonların sonuçları ayrıca SimMechanics® benzetimi oluşturularak doğrulanmış ve benzetim çıktıları sunulmuştur.
Active Fault Tolerant Control of a Wind Farm System
(IFAC Secretariat, 2018) Simani, Silvio; Turhan, Cihan; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
In order to enhance the 'sustainability’ of offshore wind farms, thus skipping unplanned maintenance operations and costs, that can be important for offshore systems, the earlier management of faults represents the key point. Therefore, this work studies the development of an adaptive sustainable control scheme with application to a wind farm benchmark consisting of nine wind turbine systems. They are described via their nonlinear models, as well as the wind and wake effects among the wind turbines of the wind park. The fault tolerant control strategy uses the recursive estimation of the faults provided by nonlinear estimators designed via a nonlinear differential algebraic tool. This aspect of the study, together with the more straightforward solution based on a data-driven scheme, is the key issue when on-line applications are proposed for a viable implementation of the proposed solutions.
Citation - WoS: 4
Citation - Scopus: 5
Active Heat Transfer Enhancement by Interface-Localized Liquid Dielectrophoresis Using Interdigitated Electrodes
(Elsevier, 2022-04) Yenigün, Onur; Barışık, Murat; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
We introduced an active heat transfer control between graphene and water using interdigitated electrodes (IDEs). Oppositely charged co-planer electrodes embedded on a graphene surface created a non-uniform electric field. Resulted interface localized liquid dielectrophoresis (LDEP) perpendicular to surface enhanced the water/graphene coupling and decreased interfacial thermal resistance (ITR) substantially. We correlated the theoretical calculations of average electric field strength near surface with Kapitza values measured at corresponding electrode configurations. We obtained a unified linear variation of Kapitza as a function of average electric strength independent of electrode size and charge. By increasing the electric field strength, we measured up to 96% decrease of Kapitza near electrodes. Since the IDEs generated electric field was only interface localized, it required lower electrode charges than any parallel-plate capacitor systems. We showed that ITR remains effective in heat transfer behavior for systems as big as 100nm such that interface localized electric field can at least increase the heat removal 50% by eliminating the ITR from both graphene/water interfaces of a channel system. By converting hydrophobic few-layer graphene to super-hydrophilic condition with ultra-low Kapitza, current results are important for graphene-based materials considered for the solution of the thermal management problem of current and next generation micro/nano-electronics.
Citation - Scopus: 2
Adaptive Actuator Failure Compensation for Concurrently Actuated Manipulators
(Elsevier, 2003) Keçeci, Emin Faruk; Tang, Xidong; Tao, Gang; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
This paper presents an adaptive actuator failure compensation method, which compensates for uncertainties due to unknown actuator failures and system dynamics, for a class of redundant manipulators where some joints concurrently actuated. Physical realization of concurrently actuated manipulators and their advantageous of use have been understood before, but adaptive failure compensation is still an open issue. In this research, failure formulation, controller structure and adaptive update rules for handling uncertainties from both the system dynamics and the failures are studied. The system stability is shown by a modified Lyapunov. Simulation results show the effectiveness of the proposed adaptive failure compensation control design.
Adaptive Actuator Failure Compensation for Cooperating Multiple Manipulator Systems
(Elsevier, 2003) Keçeci, Emin Faruk; Tang, Xidong; Tao, Gang; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
This paper presents adaptive actuator failure compensation for a cooperating multiple manipulator system with uncertain actuator failures in the task space. Advantages of designing control schemes in task spaces are emphasized, applications of task space control in robotics are discussed and a short review on control algorithms for cooperating multiple manipulator systems is given. Dynamic equations of motion of the multiple manipulator system in the task space are derived, and the adaptive actuator failure compensation problem is formulated. A compensation controller structure is proposed, for which adaptive parameter update laws are developed. The adaptive control scheme is able to compensate for the uncertainties arising from both the system parameters and the actuator failures. Based on Lyapunov stability analysis, the closed-loop signal boundedness and the convergence of the tracking error to zero are ensured. © 2003 International Federation of Automatic Control.
Citation - WoS: 6
Citation - Scopus: 11
Adaptive Actuator Failure Compensation for Redundant Manipulators
(Cambridge University Press, 2009-01) Keçeci, Emin Faruk; Tang, Xidong; Tao, Gang; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
This paper presents an adaptive actuator failure compensation method, which compensates for uncertainties due to unknown actuator failures for redundant manipulator systems. The method is first developed for manipulators whose joints are concurrently actuated. While physical realization of concurrently actuated manipulators and the advantages of their use have been understood before, in this paper failure modeling, controller structure, and adaptive update rules for handling uncertainties from the actuator failures are studied. The adaptive actuator failure compensation method is then expanded for a cooperating multiple manipulator system with uncertain actuator failures. Dynamic equations of such a multiple manipulator system in the task space are derived and the adaptive actuator failure compensation problem is formulated in the task space, for which a compensation controller structure is proposed with stable adaptive parameter update laws. The adaptive control scheme is able to compensate for the uncertainties of system parameters and actuator failures in a more general sense. For both cases, closed-loop system stability and asymptotic tracking are proved, despite uncertain system failures.
Citation - WoS: 1
Citation - Scopus: 1
Adaptive Signal Processing Strategy for a Wind Farm System Fault Accommodation
(Institute of Electrical and Electronics Engineers, 2018-03) Simani, Silvio; Turhan, Cihan; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
In order to enhance the 'sustainability' of offshore wind farms, thus skipping unplanned maintenance operations and costs, that can be important for offshore systems, the earlier management of faults represents the key point. Therefore, this work studies the development of an adaptive sustainable control scheme with application to a wind farm benchmark consisting of nine wind turbine systems. They are described via their nonlinear models, as well as the wind and wake effects among the wind turbines of the wind park. The fault tolerant (i.e., sustainable) control strategy uses the recursive estimation of the faults provided by nonlinear estimators designed via a nonlinear differential algebraic tool. These estimators are not affected by the model uncertainty and the wake effects among the wind turbines. This work exploits also a data-driven method used for estimating the analytical form of these disturbance functions, which are employed for obtaining the nonlinear fault reconstructors. Note that purely analytic approaches, where the model nonlinearity and the disturbance decoupling features are directly taken into account, may lead to more complex design tools. This aspect of the study, together with the more straightforward solution based on a data-driven scheme, is the issue when online applications are proposed for a viable implementation of the proposed solutions. The benchmark is exploited to verify the features of the developed strategies with respect to various fault situations and unavoidable model-reality mismatch.
Citation - WoS: 17
Citation - Scopus: 25
Adaptive Vehicle Skid Control
(Elsevier Ltd., 2006-06) Keçeci, Emin Faruk; Tao, Gang; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
In this paper, adaptive vehicle skid control, for stability and tracking of a vehicle during slippage of its wheels without braking, is addressed. Two adaptive control algorithms are developed: one for the case when no road condition information is available, and one for the case when certain information is known only about the instant type of road surface on which the vehicle is moving. The vehicle control system with an adaptive control law keeps the speed of the vehicle as desired by applying more power to the drive wheels where the additional driving force at the non-skidding wheel will compensate for the loss of the driving force at the skidding wheel, and also arranges the direction of the vehicle motion by changing the steering angle of the two front steering wheels. Stability analysis proves that the vehicle position and velocity errors are both bounded. With additional road surface information available, the adaptive control system guarantees that the vehicle position error and velocity error converge to zero asymptotically even if the road surface parameters are unknown.
Citation - WoS: 6
Citation - Scopus: 7
Aerodynamic Optimization of Through-Flow Design Model of a High By-Pass Transonic Aero-Engine Fan Using Genetic Algorithm
(SAGE Publications Inc., 2018-05) Kor, Orçun; Acarer, Sercan; Özkol, Ünver; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
This study deals with aerodynamic optimization of a high by-pass transonic aero-engine fan module in a through-flow inverse design model at cruise condition. To the authors’ best knowledge, although the literature contains through-flow optimization of the simplified cases of compressors and turbines, an optimization study targeting the more elaborate case of combined transonic fan and splitter through-flow model is not considered in the literature. Such a through-flow optimization of a transonic fan, combined with bypass and core streams separated by an aerodynamically shaped flow splitter, possesses significant challenges to any optimizer, due to highly non-linear nature of the problem and the high number of constraints, including the fulfillment of the targeted bypass ratio. It is the aim of this study to consider this previously untouched area in detail and therefore present a more sophisticated and accurate optimization environment for actual bypass fan systems. An in-house optimization code using genetic algorithm is coupled with a previously developed in-house through-flow solver which is using a streamline curvature technique and a set of in-house calibrated empirical models for incidence, deviation, loss and blockage. As the through-flow models are the backbone of turbomachinery design, and great majority of design decisions are taken in this phase, such a study is assessed to result in significant guidelines to the gas turbine community.
Ağır Ticari Araçlarda Kullanılan Bir Volanın Parametrik Optimizasyon Yöntemiyle Tasarımının İyileştirilmesi
(2022) Sırmalılar, Mehmet Yalçın; Haktanır, Murat; Saklakoğlu, Nurşen; Eş, Caner; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
Otomotiv endüstrisinde rekabetçi olabilmenin anahtarı ürün geliştirmenin ilk aşamalarında üretim maliyetini ve ürün performansını düşünerek daha iyi yapısal tasarımlar elde etmektir. Son yıllarda sonlu eleman analizindeki gelişmeler daha güvenli ve daha ucuz tasarımların oluşturulmasını sağlamış ve bu yeteneği kazanan firmalar önemli avantajlar elde etmiştir. Bu çalışmada Dönmez Debriyaj firmasında seri üretimi yapılan bir volanın malzeme maliyetini azaltmak üzere boyut optimizasyonu gerçekleştirilmiştir. Bilgisayar destekli sonlu elemanlar yöntemi ile volanın çalışma koşulları simüle edilmiş, parametrik optimizasyon yöntemi ile volan için istenen mekanik özellikleri sağlamanın yanı sıra maliyeti en düşük tutacak şekilde optimizasyon yapılmıştır. Bu çalışma sonunda volan ağırlığı 27,956 kg’dan 26,019 kg’a düşürülerek, toplam volan ağırlığından %6,93 azaltma sağlanmıştır ve ilgili volan, analizlerden elde edilen sonuçlar doğrultusunda talaşlı üretim ile revize edilerek üretilmiş ve araç testine tabi tutulmuştur. Bu test sonucunda hiçbir hasarla karşılaşılmamıştır.
Citation - WoS: 17
Citation - Scopus: 25
Air Leakage Measurement and Analysis in Duct Systems
(Elsevier Ltd., 2006-03) Aydın, Çiğdem; Özerdem, Barış; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
Air ducts and related equipments are used in a large number of buildings having thermal comfort. In this study, energy loss related with air leakage is studied. The leakage measurement setup was produced according to NEN-EN standards and the evaluation of data have been conducted by using power law model. The measurements were made on 300 and 1000 mm diameter single circular ducts, 300 mm × 250 mm and 1000 mm × 500 mm flanged joint rectangular ducts, 300 and 630 mm diameter circular beaded slip joint ducts, 300 mm × 200 mm and 500 mm × 300 mm rectangular flanged and drive slip joint ducts, and an branched air distribution system having different diameters for positive internal pressures. Test results have showed that the most of air leakage is from the joints. The seam contribution to air leakage is relatively lower than the joints. Using sealing gaskets help to improve the air leakage by about 50%.
Citation - WoS: 82
Citation - Scopus: 92
Airfoil Optimization for Noise Emission Problem and Aerodynamic Performance Criterion on Small Scale Wind Turbines
(Elsevier Ltd., 2012-10) Göçmen, Tuhfe; Özerdem, Barış; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
Noise emission is one of the major concerns in wind turbine industry and especially for small scale wind turbines, which are mostly erected to the urban areas; the concern is turning into a problem. This paper focuses on the optimization of six airfoils which are widely used on small scale wind turbines in terms of the noise emission and performance criteria and the numerical computations are performed for a typical 10 kW wind turbine. The main purpose of this optimization process is to decrease the noise emission levels while increasing the aerodynamic performance of a small scale wind turbine by adjusting the shape of the airfoil. The sources of the broadband noise emission are defined and their dominancy is investigated with respect to the operating conditions. While redesigning, together with the principals of reducing the airfoil self-noise, the aerodynamic prospects of increasing the performance have been taken into account. The codes which are based on aero-acoustic empirical models and a collection of well-known aerodynamic functions are used in this study. The results obtained from the numerical analysis of the optimization process have shown that, the considered commercial airfoils for small scale wind turbines are improved in terms of aero-acoustics and aerodynamics. The pressure sides of the baseline airfoils have been manipulated together with the trailing edge and redesigned airfoils have lower levels of noise emission and higher lift to drag ratios. © 2012 Elsevier Ltd.
Citation - WoS: 1
Citation - Scopus: 1
Alternating Error Effects on Decomposition Method in Function Generation Synthesis
(Springer Verlag, 2017) Maaroof, Omar W.; Dede, Mehmet Ismet Can; Kiper, Gokhan; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
In approximate function generation synthesis methods, error between the desired function's output and designed mechanism's output oscillate about zero error while crossing the zero error margin at precision points. The common goal of these methods is to minimize the error within the selected working region of the mechanism. For mechanisms like Bennett overconstrained six-revolute jointed linkages that have relatively large number of construction parameters, it is a difficult task to solve for them at once. Decomposition method enables to divide such linkages into two loops and independently solve for each loop with less construction parameters. Although some approximation methods are proven to produce smaller errors than others for a single-loop synthesis, in this work, it is shown that smaller errors are not guaranteed for a certain method when used along with decomposition method. Numerical examples indicate that in decomposition method, more attention should be given to the alternation of the error of each decomposed mechanism, rather than the approximation method used.
Alüminyum Kapalı Hücreli Köpüklerin Toz Metalürjisi Yönetimi ile Üretilmesi
(Pamukkale Üniversitesi, 2004) Güden, Mustafa; Kavi, Halit; Toksoy, Ahmet Kaan; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
Son şekle yakın Alüminyum kapalı hücreli yapılar, örneğin otomobil tampon ve kapıları, tabletlerin köpükleştirilmesi metodu olarak bilinen toz metalürjisi yöntemi ile hazırlanmaktadır. Metot tozların karıştırılması, sıcak preslenmesi ve elde edilen toz tabletlerin kullanılan alaşımın ergime sıcaklığının üstüne ısıtılması suretiyle köpükleştirilmesi süreçlerinden oluşmaktadır. Bu çalışmada, toz metalürjisi metodu ile kapalı hücreli alüminyum köpük metal üretim parametreleri ve üretim sonucu ortaya çıkan mikroyapılar, köpüğün yoğunluğuna bağlı mekanik özellikleri ile birlikte özetlenmektedir. Son olarak, alüminyum köpük metalin yuvarlak tüplerde dolgu malzemesi olarak kullanımına yönelik deneysel çalışmaların sonuçları otomobil ezilme kutularında kullanımına yönelik örnek olarak verilmiştir.
Alüminyum Köpük Dolu Alüminyum Tüplerin Ezilme Davranışları
(Pamukkale Üniversitesi, 2004) Kavi, Halit; Yüksel, Sinan; Tanoğlu, Metin; Güden, Mustafa; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
Son yıllarda hafif alüminyum köpük dolu tüplerin çarpışma enerjisi sönümleme amaçlı kullanımı için artan bir ilgi vardır. Tekli veya iç içe geçmiş köpük dolu tüpler bu amaç doğrultusundaki bu uygulamalar için çalışılmasına rağmen altıgen ve kübik paketleme geometrileri henüz araştırılmamıştır. Bu çalışmanın nihai amacı tekli köpük dolu tüplerin enerji emme kapasitesini artıracak çoklu tüp geometrilerini belirlemektir. Dolgu malzemesi olarak kullanılan alüminyum köpük malzemeler toz metalürjisi yöntemi ile hazırlanmıştır. Köpük numuneler blok köpük malzemeden kesilerek hazırlanmıştır. Alüminyum köpük dolu tekli tüpler üzerinde basma testleri yapılmış ve sonuçlar ortalama ezilme kuvveti cinsinden değerlendirilmiştir.
Alüminyum Köpük Dolu Kompozit/alüminyum İkili Tüplerin Ezilme Davranışları
(Pamukkale Üniversitesi, 2006-04) Yüksel, Sinan; Tanoğlu, Metin; Güden, Mustafa; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
Tüp sarma yöntemiyle hazırlanan ince duyarlı cam fiber takviyeli polyester kompozit/Alüminyum ikili tüplerin ezilme davranışları statik basma hızlarında (25 mm/dak) deneysel incelenmiştir. Tüplerde dolgu malzemesi olarak kullanılan Al köpüğün ezilme yük değerlerine ve deformasyon mekanizmalarına etkileri belirlenmiştir.
Alüminyum Oksit Uzun Fiber Destekli Mg Matris Kompozitlerin Statik ve Yüksek Hız Basma Davranışı
(Pamukkale Üniversitesi, 2004) Akil, Övünç; Güden, Mustafa; Çiftçioğlu, Muhsin; Hall, Ian W.; Taşdemirci, Alper; 03.02. Department of Chemical Engineering; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
Bu çalışmada uzun alüminyum oksit (FP™) fiber destekli magnezyum matris kompozitlerin enine basma davranışının deformasyon hızına bağlı değişimi araştırılmıştır. Silindirik numuneler fiber doğrultusuna dik yönde değişik uzama oranlarında Split Hopkinson basınç çubuğu ve statik mekanik test cihazı kullanılarak test edilmiş uzama-gerilme ilişkileri incelenmiştir. Bunun yanında optik mikroskop ve SEM kullanılarak kırılma mekaniği belirlenmeye çalışılmıştır. Çalışma sonucunda malzemenin enine basma mukavemetinin deformasyon hızı ile arttığı tespit edilmiş olup mikro-yapı incelemesinde deformasyonun ikizlenme ve kayma ile gerçekleştiği belirlenmiştir.
Citation - WoS: 1
Citation - Scopus: 2
Analysis and Application of Advanced Control Strategies To a Heating Element Nonlinear Model
(IOP Publishing Ltd., 2017-01) Turhan, Cihan; Simani, Silvio; Zajic, Ivan; Gökçen Akkurt, Gülden; 03.10. Department of Mechanical Engineering; 03.06. Department of Energy Systems Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
This paper presents the design of different control strategies applied to a heating element nonlinear model. The description of this heating element was obtained exploiting a data-driven and physically meaningful nonlinear continuous-time model, which represents a test-bed used in passive air conditioning for sustainable housing applications. This model has low complexity while achieving high simulation performance. The physical meaningfulness of the model provides an enhanced insight into the performance and functionality of the system. In return, this information can be used during the system simulation and improved model- based and data-driven control designs for tight temperature regulation. The main purpose of this study is thus to give several examples of viable and practical designs of control schemes with application to this heating element model. Moreover, extensive simulations and Monte- Carlo analysis are the tools for assessing experimentally the main features of the proposed control schemes, in the presence of modelling and measurement errors. These developed control methods are also compared in order to evaluate advantages and drawbacks of the considered solutions. Finally, the exploited simulation tools can serve to highlight the potential application of the proposed control strategies to real air conditioning systems.
Analysis and Comparison of the Projectile Impact Response of an Electron Beam Melt-Ti64 Body Centered Cubic Lattice-Cored Sandwich Plate
(Springer, 2025) Erten, H.İ.; Çimen, G.; Yıldıztekin, F.M.; Güden, M.; 03.10. Department of Mechanical Engineering; 03. Faculty of Engineering; 01. Izmir Institute of Technology
Background: One potential application of additively fabricated lattice structures is in the blade containment rings of gas turbine engines. The blade containment rings are expected to be able to absorb the kinetic energy of a released blade (broken blade) in order to protect the engine parts from damaging. Metallic lattice-cored sandwich plates provide a gap (free space) between two face sheets, which helps to arrest the released blade and increases the energy absorption capability of containment rings. Objective: The objective was to investigate numerically the projectile impact response of Body-Centered-Cubic (BCC) Electron-Beam-Melt (EBM) lattice-cored/Ti64 face sheet sandwich plates as compared with that of an equal-mass monolithic EBM-Ti64 plate. Methods: The projectile impact simulations were implemented in LS-DYNA using the previously determined flow stress and damage models and a spherical steel impactor at the velocities ranging from 150 to 500 m s−1. The experimental projectile impact tests on the monolithic plate were performed at two different impact velocities and the results were used to confirm the validity of the used flow stress and damage models for the monolithic plate models. Results: Lower impact stresses were found numerically in the sandwich plate as compared with the monolithic plate at the same impact velocity. The bending and multi-cracking of the struts over a wide area in the sandwich plate increased the energy absorption and resulted in the arrest of the projectile at relatively high velocities. While monolithic plate exhibited a local bent area, resulting in the development of high tensile stresses and the projectile perforations at lower velocities. Conclusions: The numerical impact stresses in the sandwich plate were distributed over a wider area around the projectile, leading to the fracture and bending of many individual struts which significantly increased the resistance to the perforation. Hence, the investigated lattice cell topology and cell, strut, and face sheet sizes and the lattice-cored sandwich plate was shown potentially more successful in stopping the projectiles than the equal-mass monolithic plates. © The Author(s) 2025.

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